mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
058a8f7f73
This patch adds three APIs to replace the iph->tot_len setting and getting in all places where IPv4 BIG TCP packets may reach, they will be used in the following patches. Note that iph_totlen() will be used when iph is not in linear data of the skb. Signed-off-by: Xin Long <lucien.xin@gmail.com> Reviewed-by: David Ahern <dsahern@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* Definitions for the IP protocol.
|
|
*
|
|
* Version: @(#)ip.h 1.0.2 04/28/93
|
|
*
|
|
* Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
|
*/
|
|
#ifndef _LINUX_IP_H
|
|
#define _LINUX_IP_H
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <uapi/linux/ip.h>
|
|
|
|
static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
|
|
{
|
|
return (struct iphdr *)skb_network_header(skb);
|
|
}
|
|
|
|
static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
|
|
{
|
|
return (struct iphdr *)skb_inner_network_header(skb);
|
|
}
|
|
|
|
static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
|
|
{
|
|
return (struct iphdr *)skb_transport_header(skb);
|
|
}
|
|
|
|
static inline unsigned int ip_transport_len(const struct sk_buff *skb)
|
|
{
|
|
return ntohs(ip_hdr(skb)->tot_len) - skb_network_header_len(skb);
|
|
}
|
|
|
|
static inline unsigned int iph_totlen(const struct sk_buff *skb, const struct iphdr *iph)
|
|
{
|
|
u32 len = ntohs(iph->tot_len);
|
|
|
|
return (len || !skb_is_gso(skb) || !skb_is_gso_tcp(skb)) ?
|
|
len : skb->len - skb_network_offset(skb);
|
|
}
|
|
|
|
static inline unsigned int skb_ip_totlen(const struct sk_buff *skb)
|
|
{
|
|
return iph_totlen(skb, ip_hdr(skb));
|
|
}
|
|
|
|
/* IPv4 datagram length is stored into 16bit field (tot_len) */
|
|
#define IP_MAX_MTU 0xFFFFU
|
|
|
|
static inline void iph_set_totlen(struct iphdr *iph, unsigned int len)
|
|
{
|
|
iph->tot_len = len <= IP_MAX_MTU ? htons(len) : 0;
|
|
}
|
|
#endif /* _LINUX_IP_H */
|